A high-severity vulnerability (CVE-2026-83212) exists in the Siebel Apps - Self Service product of Oracle Siebel CRM, specifically in the Helpdesk/Training component. The vulnerability affects supported versions from 17.0 through 26.7. It allows a low-privileged attacker with network access via HTTP to potentially take over the Siebel Apps - Self Service. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Oracle has released a Critical Security Patch Update in September 2026 that addresses this and many other vulnerabilities across multiple products, including Siebel Applications. Oracle strongly recommends applying the available patches promptly to mitigate the risk.